Abstract
The metavolcano-sedimentary sequence east of Ife and Ilesha southwest Nigeria has previously been classified as a proterozoic mobile belt. Field observations indicate, however, that this sequence has a typical, for Archaean, granite-greenstone rock succession. Geochemical data could support this opinion. In spite of the lack of age determinations, it is possible to place these rock successions in the early Archaean. This new classification of the metavolcano-sedimentary sequence of the Ife-IIesha area is, therefore, of far-reaching economic importance. The known mineralizations of gold, cassiterite, niobite, tantalite and tungsten in this area and its surroundings call for further prospection, not only in southwest Nigeria, but also in the other mobile belt region of Nigeria. One important result is the fact that geochemical methods are a tool for the stratigraphic classification and rock genesis in areas with strong lateritic weathering or metamorphic overprint.
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